Finding the Fourth Proportional to 72,816.72, 100,485.41 and 40,985.34

Step by Step Solution

1. Step 1: Write the proportion equation
   72,816.72 : 100,485.41 = 40,985.34 : x
2. Step 2: Convert to fraction form
   72,816.72/100,485.41 = 40,985.34/x
3. Step 3: Cross multiply
   72,816.72x = 100,485.41 × 40,985.34
4. Step 4: Simplify right side
   72,816.72x = 4,118,428,488.96
5. Step 5: Solve for x
   x = 4,118,428,488.96/72,816.72
6. Step 6: Final answer
   x = 56,558.83